I would have been upset too, luckily, our pedi is very pro breastfeeding and most of our handouts mention breast and not bottle. This is the first pedi we have ever had that has done this. Now, they may give the bottle fed kids different hand outs? I'm not sure, but I know every checklist we have had has mentioned nursing and how long they do it, not how many ounces they take in, ect...
You had every right to be annoyed, and good for you for bringing it up.